Add contrib/pg_stat_statements for server-wide tracking of statement execution

statistics.

Takahiro Itagaki

contrib/pg_stat_statements/pg_stat_statements.sql.in

@@ -0,0 +1,31 @@
+/* $PostgreSQL: pgsql/contrib/pg_stat_statements/pg_stat_statements.sql.in,v 1.1 2009/01/04 22:19:59 tgl Exp $ */
+
+-- Adjust this setting to control where the objects get created.
+SET search_path = public;
+
+-- Register functions.
+CREATE FUNCTION pg_stat_statements_reset()
+RETURNS void
+AS 'MODULE_PATHNAME'
+LANGUAGE C;
+
+CREATE FUNCTION pg_stat_statements(
+    OUT userid oid,
+    OUT dbid oid,
+    OUT query text,
+    OUT calls int8,
+    OUT total_time float8,
+    OUT rows int8
+)
+RETURNS SETOF record
+AS 'MODULE_PATHNAME'
+LANGUAGE C;
+
+-- Register a view on the function for ease of use.
+CREATE VIEW pg_stat_statements AS
+  SELECT * FROM pg_stat_statements();
+
+GRANT SELECT ON pg_stat_statements TO PUBLIC;
+
+-- Don't want this to be available to non-superusers.
+REVOKE ALL ON FUNCTION pg_stat_statements_reset() FROM PUBLIC;